Eyelash Applicator Teeth Asymmetry for Penetration and Loading
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Solution Overview
Problem
Existing eyelash and eyebrow applicators face challenges in penetrating lashes effectively, smoothing products, and separating lashes during application, with rigid teeth being desirable for better load capacity but difficult to produce in hard thermoplastic materials.
Innovation Solution
The design features a core with rows of teeth where the free ends are at different distances from the longitudinal axis, allowing for improved penetration and product loading without compromising grip, using a thermoplastic material that can be molded into a rigid form for better performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If teeth are made of rigid thermoplastic material, then load capacity and product carrying ability improve, but manufacturing difficulty increases and flexibility during demolding decreases
Solution Approach 1:
The patent changes the geometric parameters of the teeth by arranging them at different distances from the longitudinal axis, creating an asymmetric configuration that optimizes both structural strength and manufacturability. This parameter variation allows rigid materials to be used while maintaining ease of production through optimized molding design.
Solution Approach 2:
The teeth are arranged asymmetrically with respect to the longitudinal axis of the core, with different distances from the axis creating a non-uniform distribution. This asymmetric arrangement enhances load capacity while facilitating manufacturing by optimizing the stress distribution and mold design.
2Ease of manufacture
If teeth are arranged radially, then manufacturing simplicity improves, but penetration effectiveness and lash separation capability decrease
Solution Approach 1:
The patent departs from symmetric radial arrangement by positioning teeth at different distances from the longitudinal axis. This asymmetric configuration improves penetration effectiveness and lash separation while remaining compatible with standard molding processes.
Solution Approach 2:
Different regions of the applicator head have teeth with different characteristics (different distances from axis), creating local variations in function. This allows optimization of penetration and separation in specific areas while maintaining overall manufacturing simplicity.
3Ease of manufacture
If teeth are made flexible, then demolding ease improves, but load capacity and rigidity during application decrease
Solution Approach 1:
The patent optimizes the geometric parameters of the teeth and their arrangement to achieve sufficient rigidity with rigid thermoplastic materials, eliminating the need for flexible materials while maintaining demolding ease through proper design of the molding process.
Data Source
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AI summary
The device (1) has an applicator (2) applying a product (P) on eyelashes or eyebrows and comprising an elongated core and teeth rows. The teeth rows are connected to respective longitudinal faces of the core. Each teeth row has a set of teeth connected by making an angle with a normal to the corresponding face of the core, and another set of teeth connected by making another angle with the normal to the corresponding face of the core. The teeth of the sets have free ends placed at distances from a longitudinal axis of the core, respectively.